<template>
  <div>
       <!-- 面包屑区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert :closable="false" title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon></el-alert>
        <el-row>
        <el-col>
          <!-- 级联选择器菜单 -->
          <span class="el-span">选择商品分类  :</span>
          <el-cascader :props="cateProps" v-model="selectedCateKeys" :options="catelist" expand-trigger='hover' @change="handleChange"></el-cascader>
          <!-- tab栏切换 -->
          <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <el-tab-pane label="动态参数" name="many" >
            <!-- 添加属性的按钮 -->
              <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
              <!-- 动态参数表格 -->
              <el-table :data="manyTableData" border stripe>
                 <!-- 展开列 -->
                <el-table-column type="expand" label="展开">
                  <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handelClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <!-- 添加按钮 -->
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                  </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index" label="序列"></el-table-column>
                <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                  </template>
                </el-table-column>
              </el-table>
          </el-tab-pane>
          <el-tab-pane label="静态属性" name="only">
            <!-- 添加属性按钮 -->
              <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
               <!-- 静态参数数据 -->
              <el-table :data="onlyTableData" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand" label="展开">
                  <template slot-scope="scope">
                    <!-- 循环渲染Tag标签 -->
                    <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handelClose(i, scope.row)">{{item}}</el-tag>
                    <!-- 输入的文本框 -->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <!-- 添加按钮 -->
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                  </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index" label="序列"></el-table-column>
                <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                  <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">修改</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                  </template>
                </el-table-column>
              </el-table>
          </el-tab-pane>
          </el-tabs>
        </el-col>
        </el-row>       
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText "
      :visible.sync="addDialogVisible"
      width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="addForm.attr_name"></el-input>
      </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
     <el-dialog
      :title="'修改' + titleText "
      :visible.sync="editDialogVisible"
      width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
      <el-form-item :label="titleText" prop="attr_name">
        <el-input v-model="editForm.attr_name"></el-input>
      </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
    return {
      // 商品分类参数
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      activeName: 'many',
      // 这是动态参数的数据
      manyTableData: [],
      // 这是静态参数的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          {required: true, message: '请输入参数名称', trigger: 'blur'}
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改表单的数据对象
      editForm: {},
      // 添加表单对象 验证规则
      editFormRules: {
        attr_name: [
          {required: true, message: '请输入参数名称', trigger: 'blur'}
        ]
      }
      };
    },
    created() {
        this.getCateList()
    },
    methods: {
      handleClick(tab, event) {
        // console.log(tab, event);
      },
     async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if (res.meta.status !== 200) {
      return this.$message.error('获取商品分类失败！')
      }

      this.catelist = res.data

      // console.log(this.catelist)
      },
      // 级联选择框会选中项变化 会触发这个函数
      handleChange() {
       this.getParamsData()
     },
      // tab 页签的点击处理函数
      handleTabClick() {
        // console.log(this.activeName);
        this.getParamsData()
      },
      // 获取参数的列表数据
     async getParamsData() {
         // 证明选中的不是三级分类
          if(this.selectedCateKeys.length !== 3) {
            this.selectedCateKeys = []
            this.manyTableData = []
            this.onlyTableData = []
            return
          }
          // 没有return 证明选中的是三级分类
        // console.log(this.selectedCateKeys);
        const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
            params: { sel: this.activeName}
        })
        if(res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败！')
        }        
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          // 文本框中输入的值
          item.inputValue = ''
        })
        console.log(res.data);
        if(this.activeName === 'many') {
          this.manyTableData = res.data
        }else {
          this.onlyTableData = res.data
        }
      },
      // 添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      // 点击按钮 添加属性
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if(!valid) return
        const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
        if (res.meta.status !== 201) {
        return this.$message.error('添加参数失败！')
      }
      this.$message.success('添加参数成功!')
      this.addDialogVisible = false
      this.getParamsData()
        })
      },
      // 点击按钮 展示修改的对话框
     async showEditDialog(attr_id) {
        // 查询当前参数的信息
       const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
          params: {
            attr_sel: this.activeName
          }
        })
         if(res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败！')
        }
        this.editForm = res.data
        this.editDialogVisible = true
      },
      // 重置修改的表单
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      // 点击按钮 修改信息参数
      editParams() {
         this.$refs.editFormRef.validate(async valid => {
          if(!valid) return
        const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          })
        if (res.meta.status !== 200) {
        return this.$message.error('添加参数失败！')
      }
      this.$message.success('添加参数成功!')
      this.editDialogVisible = false
      this.getParamsData()
        })
      },
      // 根据文本删除对应的id
      async removeParams(attr_id) {
        //  console.log(id);
        // 弹框提示询问用户是否删除信息
       const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
         
        // console.log(confirmResult);
        if(confirmResult !== 'confirm') {
          return this.$message.info('已取消删除')
        }
        // console.log('确认了删除');
        const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
          if(res.meta.status !== 200) {
            this.$message.error('删除用户失败!')
          } 
          this.$message.success('删除用户成功!')
          // 重新获取用户类表数据
          this.getParamsData()
       },
       // 文本框失去焦点 或者当按下Enter是触发的方法
      async handleInputConfirm(row) {
        //  console.log('ok');
        if(row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        // 如果没有return, 则证明输入的内容, 需要做后续的处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 需要发起请求 保存这次操作   
       this.saveAttrVals(row)
         
       },
       // 将对attr_vals 的操作 保存到数据库
      async saveAttrVals(row) {
          // 需要发起请求 保存这次操作   
          const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if(res.meta.status !== 200) {
          return this.$message.error('修改参数项失败!')
        }
       },
       // 点击按钮 展示文本输入框
       showInput(row) {
         row.inputVisible = true
         // 让文本框中自动获取焦点
         // $nextTick 方法的作用 就是当页面中的元素被重新渲染页面之后   才会指定回调函数的代码
         this.$nextTick(_ => {
          this.$refs.saveTagInput.$refs.input.focus();
        });
       },
       // 删除对应的id和选项
       handelClose(i, row) {
         row.attr_vals.splice(i, 1)
         this.saveAttrVals(row)
       }
    },
    computed: {
      // 如果按钮需要被禁用, 则返回true, 否则返回false
      isBtnDisabled() {
        if(this.selectedCateKeys.length !== 3) {
          return true
        }
        return false
      },
      // 选中当前的三级分类的id
      cateId() {
        if(this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      // 动态计算标题的文本
      titleText() {
        if(this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
    }
}
</script>

<style lang="less" scoped>
.el-alert {
    margin-bottom: 15px;
}
.el-span {
    margin-right: 10px;
}
.el-tabs {
    margin-top: 15px;
}
.el-tag {
  margin: 0 10px;
}
.input-new-tag {
  width: 130px;
}
</style>
